Most popular of the ways are explained in this article below. There are several ways that you can try and improve the FPS for a particular game on your PC.
How to Improve FPS (Frames per Second) for Better Gaming Experience? A slow FPS can totally kill the gaming experience despite the game being fabulous. Hence, FPS is an important aspect of gaming. Lesser FPS (Frames Per Second) makes the game feel slower while a higher FPS makes gaming a fun experience.